Safety-valve.



Patented-Sept. I9, 1899. T. A. BRYAN.

SAFETY VALVE.

Application filed May 18, 1899 1 (No Model.)

2 5' viii) ENS co PKUTcLuT UNITED STATES PATENT @rrrcn.

THOMAS A. BRYAN, OF BALTIMORE, MARYLAND.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 633,421, datedSeptember 19, 1899.

Application filed May 18, 1899. Serial No. 717,372. (No model.)

To aZZ whom it may concern:

Be it known that I, THOMAS A. BRYAN, a citizen of the United States,residing at Baltimore city, in the State of Maryland, have invented newand useful Improvements in Safety-Valves, of which the following is aspecification.

My invention relates to safety-valves, the object of the same being toprovide novel means whereby a close and efi'ectual seal may be madebetween the valve and its seat and a valve which will promptly return toits closing position when the excess of pressure to which it is set hasbeen removed.

Other objects of the invention will hereinafter appear.

In the ordinary device of this character it is common to cast both thevalve and its seat of metal and afterward grind these parts to make aperfect fit. This, however, is an expensive operation, and, moreover, avalve construct-ed in this manner will not reseat itself until thepressure has fallen far below that to which it was set to operate. Ithas also been proposed to employ a rubber disk as the valve; but thisalso is objectionable in that the suction to which the valve issubjectedgvill cause the same to yield or stretch, and thereby fail toopen or close at the proper time. By my invention these objections areovercome; and the same consists is certain details of construction andcombinations of parts, which will be hereinafter described and claimed.

In the drawings forming part of this specification, Figure 1 is avertical central sectional view illustrative of my invention, and Fig. 2is a plan view of the valve-seat.

Like reference-nu meralsindicate like parts in both views.

The valve-casing is made up of the two sections 1 and 2, each having aflange 3 thereon, through which pass the screws by which they aresecured to each other. The lower section 1 is provided with aninlet-port 4: and a discharge port or opening 5, at the upper end ofwhich is the valve-seat 6, the said seat being cast with the section onwhich it is formed. The upper section 2 is provided with a slottedupright 7, which serves as a guide for the adjusting-lever 8, which isfulcru'med upon lugs 9 9 on said section and is notched at intervalsalong its upper edge for the reception of weights. Secured along itsedges, between the flanges 3 3 ofthe two sections 1 and 2, is adiaphragm 10, the same being constructed of soft rubber or otherflexible material. Extending through the center of the diaphragm 10 isthe threaded valve-stem 11, the same projecting at its upper end throughand above the section 2 and supporting the adjustinglever 8. A metallicdisk or washer l2 surrounds the stem 11, rests upon the upper surface ofthe diaphragm 10, and is clamped in place thereon by a nut 13.

Below the diaphragm 10 is secured a metallio cup 14:, the same beingformed with a portion into contact with the diverging side walls of thecavity 15, and is thereby held against stretching movement in thedirection of its length. It projects slightly, however, beyond thecavityin the cup 1A andis adapted to bear with a yielding pressure uponthe valve-seat 6. The said seat therefore can be used in the conditionin which it is originally castti1at is, grinding of the seat becomes'unnecessary,as the yielding material of which the valve is made willcompensate for any unevenness in the surface of said seat.

My improved valve is particularly designed for use with gases underpressure where the temperature of said gases is low. It is, however, notrestricted to this use, although it will be found most effective undersuch conditions, as the material of which the valveis made will beunaffected.

The operation of the device, except as above set forth, is similar tothat of the ordinary diaphragm safety-valve and requires no specificdescription herein.

Having now described my invention, what I claim as new, and desire tosecure byLetters Patent, is

1. The combination with a valve-seat, of a i cup having a converginginternal surface,a yielding block expanded at one end in said cup, ascrew-threaded valve-stem extending through the block and cup, and nutsmounted on the valve-stem above the cup and below the block,respectively, and operating when screwed up on the valve-stem tocompress said block and expand one end thereof against the converginginternal surface of the cup, substantially as described.

2. The combination with a va1vecasing having a valve-seat, of a cuphaving a converging internal surface, a yielding block expanded at oneend in said cup, a screwthreaded valve-stem passing through the cup andblock and extending through the valvecasing, 11 uts mounted on thevalve-stern above the cup and below the block, respectively, andoperating when screwed up on the valvestem to compress said block andexpand one end thereof against the converging internal surface of thecup, and a vaive-seatin g device acting on the outer end of saidvalve-stem, substantially as described.

3. In a safety-valve, the combination with a valve-seat and a flexiblediaphragm, of a metallic cup secured to said diaphragm, having adovetailed cavity therein, a disk also secured to said diaphragmopposite said cup, a block of rubber or other yielding material,constituting the "aive proper, in said cavity, a threaded valve-stemextending through said disk, diaphragm, cup and block, and nuts upon theends of said stem for compressing and spreading said block and forsecuring said parts together.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

THOMAS A. BRYAN.

Witnesses:

PHIL. WITTMER, WM. H. J oNEs.

